has been closed as an exact duplicate, but there is no link to the duplicate so we can neither assess whether the closure is valid nor see the explanations in the duplicate question. It wasn't so long ago that the duplicate links were shown — is there a policy change (and if so, why?), or is it just a glitch?

1 Answer
1

Look at the post history. The asker himself edited out the duplicate message when he was adding more details. This was probably an accident; he probably started editing before the question was closed, and when he submitted his edit it overwrote Community's edit (the duplicate message) because it was more substantive.